TWI547062B - DC power supply recovery system - Google Patents

Description

DC power backup system

This creation is about a power supply source system, especially a DC power backup system.

The power supply device is a voltage conversion device for converting an alternating current power source into a direct current power source, the input end of which is connected to the mains power grid to receive an alternating current power source, and the output end is connected to the power input end of an electronic device, the power supply is the alternating current power source. After being converted to a DC power source, the DC power source is output to the electronic device as an operating power source of the electronic device.

Electronic devices such as network servers and cloud hard disks are often connected to the Internet during operation, and often have important data data to be transmitted. Therefore, these electronic devices have high power requirements. However, there is uncertainty in whether the mains grid can stabilize the power supply. If the power company is repaired by power generation equipment, there is no early warning power outage or unexpected power outage, the electronic equipment will face no electricity available. In order to avoid the situation that the electronic equipment is not available due to the inability of the mains grid to supply power, it is conventional practice to connect a battery device directly at the power input end of the electronic device to be output by the battery device when the mains grid cannot be stably powered. A direct current is used for electronic equipment.

However, since the operating voltage of the electronic device is a low voltage, generally 12V, the DC voltage provided by the battery device is a low voltage. If the output power of the battery device is P, according to the electric power function: P=IV, I is a battery device. The output current, V, is the output voltage of the battery device. Since the output voltage V of the battery device is inversely proportional to the output current I, the output current I will be increased at this low voltage. In this way, if the line impedance between the battery device and the electronic device is represented as R _LINE , R _LINE is a constant, and the line loss between the battery device and the electronic device is expressed as P _LOSS , then P _LOSS =I ² × R _LINE , it can be seen that a large output current I will increase the line loss P _LOSS , thereby reducing the power supply effect of the battery device.

Therefore, the main purpose of the present invention is to provide a DC power backup system that will provide high-voltage DC power from the battery device and relatively reduce the output current of the battery device, thereby effectively reducing the line loss between the battery device and the electronic device.

The DC power backup system is connected to a grid power supply unit and at least one AC/DC converter. The at least one AC/DC converter is connected to the DC load and includes an AC input terminal. The DC power backup system includes: The at least one automatic switching element includes a first power input end, a second power input end and a power output end, wherein the first power input end is connected to the grid power supply unit, and the power output end is configured to connect the at least one intersection The AC input end of the DC converter, when the power supply unit of the power supply unit is abnormal, the power output end is switched and connected to the second power input end; at least the current power supply backup module includes a DC output end, the DC The output end is connected to the second power input end of the at least one automatic switching element to provide a DC backup power source when the power output end of the at least one automatic switching element is switched to be connected to the second power input end At least one AC/DC converter, wherein the DC backup power source is greater than a minimum operating voltage of the at least one AC/DC converter

According to the system architecture of the present invention, when the power supply unit of the power grid is abnormally powered, the power output end of the automatic switching component is switched and connected to the second power input end, so that the at least one-way power supply backup module and the AC/DC The converter forms a connection, so that the DC backup power generated by the DC power backup module can be provided to the AC/DC converter, and the AC/DC converter converts the DC backup power into an electronic device. After working voltage, it is used by electronic equipment. Since the DC backup power supply provided by the DC power backup module is greater than the minimum operating voltage of the AC/DC converter, the general AC/ The minimum operating voltage of the DC converter is at least 90V, which is much higher than the prior art, so the output current of the DC power backup module can be reduced relatively. Therefore, once the output current of the DC power backup module is reduced, the line loss is also reduced, and the power supply provided by the DC power backup module can effectively reach the electronic device and improve the power supply effect of the DC power backup module.

10‧‧‧DC power supply backup module

11‧‧‧ battery device

110‧‧‧Battery string

111‧‧‧Battery

12‧‧‧Charging device

121‧‧‧Rectifier unit

122‧‧‧First isolation transformer

123‧‧‧First electronic switch

124‧‧‧First Synchronous Rectifier Switch Unit

125‧‧‧First filter

13‧‧‧discharge device

131‧‧‧Second isolation transformer

132‧‧‧Second electronic switch

133‧‧‧Second synchronous rectification switch unit

134‧‧‧second filter

135‧‧‧ Controller

20‧‧‧Power supply unit

21‧‧‧ Generator

22‧‧‧Power grid automatic switching element

23‧‧‧Mains grid

31‧‧‧Electronic equipment

310‧‧‧AC/DC converter

311‧‧‧Rectifier unit

312‧‧‧Rectifier unit

313‧‧‧ Controller

40‧‧‧Automatic switching element

400‧‧‧Switch unit

401‧‧‧First power detector

402‧‧‧Second power detector

403‧‧‧Switch controller

50‧‧‧Auxiliary DC power supply unit

501‧‧‧Green Energy Installation

502‧‧‧Power conversion device

503‧‧‧The third isolation transformer

504‧‧‧ Third electronic switch

505‧‧‧third synchronous rectification switch unit

506‧‧‧ third filter

51‧‧‧First switch

52‧‧‧First switch

60‧‧‧Exchange bus

61‧‧‧Battery-powered busbar

62‧‧‧Load Busbar

63‧‧‧current sharing control circuit

64‧‧‧current sharing compensation unit

FIG. 1 is a circuit block diagram of a preferred embodiment of the present DC power backup system.

Figure 2: Schematic block diagram of the automatic switching element in the present creation.

Figure 3: Schematic representation of the battery unit in this creation.

Figure 4: Schematic block diagram of the charging device in the present creation.

Figure 5: Schematic block diagram of the discharge device in the present creation.

Figure 6: Reference diagram (1) of the AC/DC converter with full-bridge rectifier provided by the discharge device in this creation.

Figure 7: In this creation, the discharge device provides DC backup power to the reference diagram (2) of the AC/DC converter including the full bridge rectifier.

Figure 8: Reference diagram (1) of the AC/DC converter containing the DC backup power supply to the discharge device in this creation.

Figure 9: Reference diagram (2) of the AC/DC converter containing the DC backup power supply to the discharge device in this creation.

FIG. 10 is a circuit block diagram of another preferred embodiment of the present DC power backup system.

Figure 11 is a block diagram showing the circuit of the power conversion device of the auxiliary DC power supply unit in the present invention.

Figure 12: Schematic diagram of a circuit block in which the DC power supply module and the AC/DC converter are connected to the automatic switching element by the battery power supply bus and the load busbar in the present invention.

Figure 13: Schematic diagram of the flow control flow of this creation.

Figure 14: Schematic diagram of the circuit diagram of the automatic switching element in this creation connected to the DC power backup module and the grid power supply unit through the battery power supply bus and the load bus.

Please refer to the DC power backup system of the present invention shown in FIG. 1 for connecting a power supply unit 20 and at least one AC/DC converter 310. The present DC power backup system includes at least a DC power supply backup module. Group 10 and at least one Automatic Transfer Switch (ATS) 40.

The AC/DC converter 310 includes an AC input terminal and a DC output terminal, and a DC output terminal is connected to an electronic device 31. The electronic device 31 is a DC load, and the AC/DC converter 310 can be a power supply device ( Power supply). The AC/DC converter 310 receives a power supply at its AC input terminal that is greater than a minimum operating voltage (at least 90 volts) of the AC/DC converter 310 to enable the AC/DC converter 310 to operate. A DC drive voltage is applied to the electronic device 31; otherwise, when the AC/DC converter 310 receives a power supply lower than its lowest operating voltage, the AC/DC converter 310 cannot be driven by sufficient power to operate.

The DC power backup module 10, the electronic device 31, the AC/DC converter 310, and the automatic switching element 40 can be disposed in a computer room of the user end. FIG. 1 illustrates only one DC power backup module 10, one electronic device 31, one AC/DC converter 310, and one automatic transfer switch (ATS) 40 as an example, but is not limited thereto. .

The grid power supply unit 20 includes a generator 21, an automatic transfer switch (ATS) 22 and a utility grid 23. The power grid automatic switching element 22 includes a first power input end, a second power input end and a power output end. The first power input end is connected to the mains grid 23, and the second power input end is connected to the generator 21 The power output is used as an output of the grid power supply unit 20. When the mains grid 23 is stably powered, the power output terminal is connected to the first power input end, so that the utility power grid 23 automatically switches the switching element 22 via the power grid. An AC power source is externally transmitted, and at this time, the generator 21 is in a standby state and is not in operation. When the mains grid 23 stops supplying power or cannot supply power stably, the power output end of the power grid automatic switching element 22 is automatically switched to be connected to the second power input end, and is activated by the generator 23 to generate AC power. The motor 21 transmits an external AC power source.

The circuit configuration of the automatic switching element 40 is the same as that of the grid automatic switching element 22. Taking the automatic switching element 40 as an example, please refer to FIG. 2, the automatic switching element 40 includes a switching unit 400, a first power detector 401, a second power detector 402 and a switching controller. 403. The switch unit 400 includes a first power input terminal A1, a second power input terminal A2 and a power output terminal A3. The first power input terminal A1 is connected to the output end of the grid power supply unit 20, and the second power input terminal A2 is connected to the DC power backup module 10, and the power output A3 is connected to the input end of the AC/DC converter 310. The first and second power detectors 401 and 402 are respectively connected to the first and second power input terminals A1 and A2 to detect the power supply status of the grid power supply unit 20 and the DC power backup module 10 respectively. 403 connects the first power source detector 401, the second power source detector 402, and the switch unit 400. When the power supply unit 20 is stably powered, the switching controller 403 determines that the power supply of the power supply unit 20 is normal according to the detection result of the first power detector 401, and connects the power output A3 to the first power input. A1, the AC power of the grid power supply unit 20 is transmitted to the AC/DC converter 310 through the automatic switching element 40. In the preferred embodiment, when the switching controller 403 determines that the AC power output by the grid power supply unit 20 is greater than the minimum operating voltage of the AC/DC converter 310, the power supply unit 20 is powered normally.

Referring to FIG. 1 , the DC power backup module 10 includes an AC/DC input terminal AC/DC and a DC output terminal DCout. The AC/DC input terminal AC/DC is connected to the first power input end of the automatic switching element 40. A1, thereby forming a connection with the grid power supply unit 20 for charging by using the AC power output by the grid power supply unit 20; the DC output terminal DCout is connected to the automatic switching The second power input terminal A2 of the switching element 40. As shown in FIG. 1 , in the preferred embodiment, the DC power backup module 10 includes a battery device 11 , a charging device 12 , and a discharging device 13 .

Referring to FIG. 1 and FIG. 3, the battery device 11 has a connecting end Vb. The battery device 11 can include a plurality of battery strings 110. Each battery string 110 includes a plurality of batteries 111 connected in series. 110 are connected in parallel with each other and connected to the connection terminal Vb. The number of battery strings 110 connected in parallel or the number of batteries 111 connected in series in each battery string 110 depends on the requirements of the electronic device 31. For example, if the output voltage of each battery string 110 should reach the minimum operating voltage required by the AC/DC converter 310, each battery string 110 should be connected in series with a corresponding number of batteries 111 to reach the AC/DC converter 310. The lowest operating voltage, on the other hand, a larger number of battery strings 110 in parallel can provide a greater amount of power to the electronic device 31.

Referring to FIG. 1 , the charging device 12 includes a charging output terminal Vcharge and the AC/DC input terminal AC/DC. The charging output terminal Vcharge is connected to the connecting end Vb of the battery device 11 . The charging device 12 connects the grid power supply unit 20 . After the supplied AC power is converted into a DC charging power source, the battery module 11 is charged through the charging output terminal Vcharge. Referring to FIG. 4 , the charging device 12 is an isolated circuit, which includes a rectifying unit 121 , a first isolation transformer 122 , a first electronic switch 123 , a first synchronous rectifying switch unit 124 , and a first a filter 125, the input end of the rectifying unit 121 is the AC/DC input terminal AC/DC, the first isolation transformer 122 includes a primary side and a secondary side, and the primary side is connected to the output end of the rectifying unit 121. After the power received from the rectifying unit 121 is converted into the DC charging power source, the second side is output; the first electronic switch 123 is connected to the primary side of the first isolation transformer 122; the first synchronous rectifying switch unit 124 The input end is connected to the secondary side of the first isolation transformer 122, and the output end is the charging output terminal Vcharge, and the first synchronous rectification switch unit 124 is responsible for outputting the secondary side of the first isolation transformer 122. The DC charging power source is rectified, and the first filter 125 is connected to the first synchronous rectification switching unit 124 to filter the DC charging power source.

Referring to FIG. 1, the discharge device 13 includes a DC input terminal DCin and a DC output terminal DCout. The DC input terminal DCin is connected to the connection terminal Vb of the battery device 11 to convert an output power of the battery device 11 into a constant The backup power source is streamed, and the DC backup power source is greater than the minimum operating voltage of the AC/DC converter 310. Referring to FIG. 5 , the discharge device 13 is an isolated circuit, which includes a second isolation transformer 131 , a second electronic switch 132 , a second synchronous rectifier switch unit 133 , and a second filter 134 . a controller 135, the second isolation transformer 131 includes a primary side and a secondary side, the primary side is the DC input terminal DCin to connect the connection end Vb of the battery device 11; the second electronic switch 132 is connected to the second isolation The primary side of the transformer 131, and the controller 135 is connected to the second electronic switch 132, and the pulse-width modulation (PWM) means can be used to control the on-period of the second electronic switch 132 to achieve the voltage regulation function, and After the second isolation transformer 131 converts the power received from the battery device 11 into a DC backup power source, the second isolation transformer 131 is output by the secondary side; the input end of the second synchronous rectifier switch unit 133 is connected to the second isolation transformer 131. The secondary side, and the output end is the DC output terminal DCout, and the second synchronous rectification switch unit 133 is responsible for rectifying the DC backup power output outputted by the secondary side of the second isolation transformer 131. The second filter 134 is connected to the second synchronous rectification switch unit 133 to filter the DC backup power supply.

As disclosed above, when the grid power supply unit 20 is stably powered, the power output terminal A3 of the automatic switching element 40 is connected to the first power input terminal A1. When the power supply unit 20 of the power supply unit 20 is abnormally powered, for example, the switching controller 403 of the automatic switching element 40 determines that the AC power is lower than the minimum operation of the AC/DC converter 310 according to the detection result of the first power detector 401. At the time of voltage, the switching controller 403 switches the power output terminal A3 of the switching unit 400 to the second power input terminal A2. In this way, the AC/DC converter 310 is disconnected from the grid power supply unit 20, and is connected to the DC power backup module 10 to enable the DC backup power generated by the discharge device 13 to pass the automatic switching. The switching element 40 is supplied to the AC/DC converter 310.

It should be noted that the DC backup power supply provided by the DC power backup module 10 can reach at least 90 volts. According to the electric power formula: P=IV, P is the output power of the discharge device 13, and I is the output of the discharge device 13. The current, V is the output voltage of the discharge device 13, so that when the output power P of the discharge device 13 is fixed, the output voltage V is high and the output current I can be relatively reduced. If the line impedance is expressed as R _LINE , R _LINE is A constant, the line loss P _LOSS = I ² × R _LINE , visible lower output current I can effectively reduce the line loss P _LOSS . Moreover, since the DC backup power source generated by the discharge device 13 has no harmonic component and is not fed back to the grid power supply unit 20, the switching operation of the automatic switching element 40 does not naturally affect the automatic switching element 22 of the power grid. There will be no malfunctions.

As shown in FIG. 6 , the AC/DC converter 310 includes a rectifying unit 311 , which may be a full bridge rectifier and includes the AC input terminal and the DC output terminal, and the rectifying unit 311 . It is composed of four rectifying diodes D1~D4. Since the DC backup power output from the DC output terminal DCout of the DC power backup module 10 is DC power, the first and fourth rectifier diodes D1 and D4 that are turned on can be determined according to the polarity of the DC backup power source. Or second and third rectifying diodes D2, D3. As shown in FIG. 6, only the first and fourth rectifying diodes D1 and D4 of the rectifying unit 311 are turned on by the forward bias, and the second and third rectifying diodes D2 and D3 are reversely biased. In the open state, the DC backup power supply can be supplied to the AC/DC converter 310 through the first and fourth rectifying diodes D1 and D4. Referring to FIG. 7, if the polarity of the DC backup power supply is opposite to the polarity shown in FIG. 6, the second and third rectifying diodes D2 and D3 are forward biased, so that the DC backup power supply can pass the first The second and third rectifying diodes D2, D3 are supplied to the AC/DC converter 310. Therefore, regardless of the polarity of the DC backup power supply, it can be provided to the AC/DC converter 310. Similarly, as shown in FIG. 8 , the AC/DC converter 310 includes a rectifying unit 312 and a controller 313 . The rectifying unit 312 can be a bridgeless rectifier and is composed of two rectifying diodes Da. The Db is connected to the two rectifier switches Sa and Sb. The controller 313 is connected to the output end of the rectifying unit 312 and the two rectifying switches Sa and Sb, and can be turned on according to the polarity of the DC backup power supply. Polar body Da and second rectification a switch Sb, and driving the first rectification switch Sa alternately turned on and off by a pulse width modulation signal (PWM) to perform voltage regulation; or referring to FIG. 9, the controller 313 turns on the second rectifying diode Db is electrically connected to the first rectifying switch Sa and alternately turned on and off by a pulse width modulation signal (PWM) to drive the second rectifying switch Sb.

Referring to FIG. 10, a second preferred embodiment of the present invention further includes an auxiliary DC power supply unit 50, a first changeover switch 51 and a first changeover switch 52. The auxiliary DC power supply unit 50 includes a green energy device 501 and a power conversion device 502. The green energy device 501 refers to a device that generates power from a green energy source (solar or fuel cell). Please refer to FIG. The device 502 includes a third isolation transformer 503, a third electronic switch 504, a third synchronous rectification switch unit 505 and a third filter 506. The third isolation transformer 503 includes a primary side and a secondary side. An input terminal Vin is connected to the green energy device 501, and the third electronic switch 504 is connected to the primary side of the third isolation transformer 503. The input end of the third synchronous rectifier switch unit 505 is connected to the third isolation transformer 503. The output side serves as the output terminal Vout of the auxiliary DC power supply unit 50 to output an auxiliary DC power supply, and the third synchronous rectification switch unit 505 is responsible for rectifying the auxiliary DC power outputted by the third isolation transformer 503. The third filter 506 is coupled to the third synchronous rectification switch unit 503 to filter the auxiliary DC power supply.

The circuit structures of the first and second switching switches 51 and 52 are the same as those of the automatic switching element 40 described above, and are not described herein. Referring to FIG. 10, the first switch 51 includes a first end B1, a second end B2, and a third end B3. The second switch 52 mainly includes a first end C1 and a second end C2. With a third end C3. The first end B1 of the first changeover switch 51 is connected to the output end of the grid power supply unit 20, and the third end B3 is connected to the first power input terminal A1 of the automatic changeover switching element 40. The first end C1 of the second changeover switch 52 is connected to the second end B2 of the first changeover switch 51. The third end C3 is connected to the output end Vout of the auxiliary DC power supply unit 50, and the second end C2 is connected to the battery device 11. The connection end Vb. The second changeover switch 52 can perform a manual mode by a user to switch its third end C3 to the first end C1 or the second end C2.

When the power supply unit 20 is stably powered, the third end B3 of the first switch 51 is connected to the first end B1, so the auxiliary DC power supply unit 50 is not connected to the power supply unit 20, and the user can Manually connecting the third end C3 of the second switch 52 to the second end C2, so that the auxiliary DC power output by the auxiliary DC power supply unit 50 can be used as the charging power source of the battery device 11, and after the charging is completed, The third end C3 of the second changeover switch 52 is switched and connected to the first end C1.

When the grid power supply unit 20 is unable to supply power, for example, when the mains grid 23 is powered off or the generator 21 is in startup or a fault occurs, the switching controller of the first changeover switch 51 detects a power supply abnormality from its first power source detector. The third end B3 is automatically connected to the second end B2, and the third end C3 of the second switch 52 is connected to the first end C1, so that the auxiliary DC power output unit 50 outputs the auxiliary DC The power source can be output to the AC/DC converter 310 through the first and second switchers 51, 52 and the automatic switching element 40, and the AC/DC input terminal AC/DC of the charging device 12 can also receive the auxiliary device. The auxiliary DC power source outputted by the DC power supply unit 50 is similar to the positive half cycle. Therefore, the charging device 12 charges the battery device 12 after the auxiliary DC power source is converted into a charging power source.

Only one DC power backup module 10, one electronic device 31 and one automatic switching element 40 have been described as an example. Referring to the preferred embodiment of FIG. 12, the system includes an automatic switching element 40, a plurality of DC power backup modules 10, and a plurality of AC/DC converters 310 connected to the plurality of electronic devices. The automatic switching element 40 The first power input terminal A1 is connected to the grid power supply unit 20 and an AC bus bar 60, and the second power input terminal A2 is connected to a battery power supply bus 61. The DC output terminals DCout of the DC power backup modules 10 are respectively connected. The battery power supply bus 61 is connected to the second power input terminal A2, and the AC and DC input terminals of the DC power backup module 10 are connected. The AC/DC is connected to the AC busbar 60 to form a connection with the first power input terminal A1. The power output terminal A3 of the automatic switching element 40 is connected to a load busbar 62, and the input of the AC/DC converter 310. The terminals are respectively connected to the load bus bar 62 to form a connection with the power output terminal A3. The DC power backup module 10, the automatic switching element 40, the AC bus 60, the battery power supply bus 61, and the load bus 62 may be disposed in a cabinet.

When the grid power supply unit 20 is stably powered, the power output terminal A3 of the automatic switching element 40 is connected to the first power input terminal A1, so that the grid power supply unit 20 passes the automatic switching element 40 and the load busbar 62. The AC power is supplied to the plurality of AC/DC converters 310, and the DC power backup modules 10 can receive power from the grid power supply unit 20 for charging. When the power supply unit 20 is powered abnormally, the automatic switching element 40 automatically switches its power output terminal A3 to the second power input terminal A2, and the discharge device 13 of each DC power backup module 10 is about the battery. After the output power of the device 11 is converted into a DC backup power supply, the DC backup power supply is supplied to each AC/DC converter through the DC output terminal DCout, the battery power supply bus 61, the automatic switching element 40, and the load bus bar 62. 310, thereby achieving the power of the backup power supply.

Referring to FIG. 12 and FIG. 13 , the DC power backup module 10 can be further electrically connected to each other through a current sharing control circuit 63 to implement current sharing control. The discharge device 13 of the DC power backup module 10 has been provided with a preset voltage parameter, so that the controller 135 of each discharge device 13 can control the conduction period of the second electronic switch 132 according to the preset voltage parameter to generate the DC. Backup power supply. When the current sharing control is implemented, the output terminal DCout of each discharge device 13 is connected in series with a super diode Ds, a resistor R and a current sharing compensation unit 64. The current sharing compensation unit 64 is connected to the controller 135. The diode Ds returns an output current signal I1, and a current sharing signal Ishare is generated by the resistor R. The current sharing signal Ishare is transmitted in the current sharing control circuit 63, and the current sharing control circuit 63 is connected to Each of the DC power backup modules 10 can be configured to adjust the output current I of the charging device 13 according to the current sharing signal Ishare. 64 current sharing compensation unit According to the difference between the output current signal I1 and the current sharing signal Ishare, a current sharing compensation parameter is generated, and the current sharing compensation parameter is transmitted to the controller 135, and the controller 135 further determines the preset voltage parameter according to the The current sharing compensation parameter controls the conduction period of the second electronic switch 132, so that the current output by each DC power backup module 10 can be averaged, and the output current of the partial DC power backup module 10 is prevented from being high. The output current of the power backup module 10 is low, so the current sharing control can improve the power supply efficiency of the DC power backup module 10.

Referring to the preferred embodiment shown in FIG. 14, the system includes a plurality of automatic switching elements 40, a plurality of DC power backup modules 10, and a plurality of AC/DC converters 310 connected to the plurality of electronic devices, or further including a The current sharing control circuit 63 as previously described achieves the function of current sharing control. The power output terminals A3 of the automatic switching element 40 are respectively connected to the input terminals of the AC/DC converters 310. The first power input terminals A1 of the automatic switching element 40 are respectively connected to a load bus bar 62. The second power input terminals A2 of the automatic switching element 40 are respectively connected to a battery power supply bus 61. The power supply unit 20 is connected to the load bus bar 62 to form a connection with the first power input terminal A1. The DC output terminals DCout of the discharge device 13 of the DC power backup module 10 are respectively connected to the battery power supply bus 61. The second power input terminal A2 forms a connection, and the AC/DC input terminals AC/DC of the DC power backup module 10 are respectively connected to the load bus bar 62 to form a connection with the first power input terminal A1. The DC power backup module 10, the automatic switching element 40, the battery power supply bus 61, and the load bus 62 may be disposed in a cabinet.

When the power supply unit 20 is stably powered, the power output terminal A3 of the automatic switching element 40 is connected to the first power input terminal A1, so that the grid power supply unit 20 passes the load bus bar 62 and the automatic switching. The switching element 40 provides AC power to the complex AC/DC converter 310, and the DC power backup module 10 can receive power from the grid power supply unit 20 for charging. When the power supply unit 20 is powered abnormally, the automatic switching element 40 automatically switches its power output terminal A3 to the second power input terminal A2, and the discharge device 13 of each DC power backup module 10 After the output power of the battery device 11 is converted into a DC backup power supply, the DC backup power supply is supplied to the AC/DC converters 310 through the battery power supply bus 61 and the automatic switching switch elements 40, respectively. This achieves the power of the backup power supply.

10‧‧‧DC power supply backup module

11‧‧‧ battery device

12‧‧‧Charging device

13‧‧‧discharge device

20‧‧‧Power supply unit

21‧‧‧ Generator

22‧‧‧Power grid automatic switching element

23‧‧‧Mains grid

31‧‧‧Electronic equipment

310‧‧‧AC/DC converter

40‧‧‧Automatic switching element

Claims (12)

A DC power backup system for connecting a grid power supply unit and at least one AC/DC converter, the at least one AC/DC converter for connecting a DC load and including an AC input terminal, the DC power backup system comprising: The at least one automatic switching element includes a first power input end, a second power input end and a power output end, wherein the first power input end is connected to the grid power supply unit, and the power output end is configured to connect the at least one intersection The AC input end of the DC converter, when the power supply unit of the power supply unit is abnormal, the power output end is switched and connected to the second power input end, so that the second power input end is electrically connected to the at least one AC/DC An AC input terminal of the converter; at least the DC power supply backup module includes a DC output terminal connected to the second power input end of the at least one automatic switching switch component to serve as the at least one automatic switch When the power output end of the component is switched and connected to the second power input end, the at least DC power backup module provides a DC backup power supply And the AC input power of the at least one AC/DC converter is greater than a minimum operating voltage of the at least one AC/DC converter. The DC power backup system of claim 1, wherein the DC power backup module comprises: a battery device having a connection end; a discharge device comprising a DC input terminal and the DC output terminal, the DC input The terminal is connected to the connection end of the battery device to convert the output power of the battery device to the DC backup power source and then provided to the at least one AC/DC converter. The DC power backup system of claim 2, wherein the DC power backup module includes an AC and DC input terminal, and the AC and DC input terminal is connected to the first power input end of the automatic switching element to utilize the power grid. The AC power supplied by the power supply unit is charged. The DC power backup system of claim 3, wherein the DC power backup module comprises a charging device, the charging device includes a charging output terminal and the AC/DC input terminal, and the charging output terminal is connected to the battery device. The connection terminal charges the battery module after converting the AC power of the utility grid into a DC charging power source. The DC power backup system of claim 4, wherein the charging device comprises: a rectifying unit, wherein the input end is the AC/DC input end; and a first isolation transformer comprising a primary side and a secondary side, The primary side is connected to the output end of the rectifying unit to convert the power received from the rectifying unit into the DC charging power source, and is outputted by the secondary side thereof; a first electronic switch is connected to the primary side of the first isolation transformer a first synchronous rectification switch unit, the input end of which is connected to the secondary side of the first isolation transformer, and the output end is the charging output end, and the first synchronous rectification switch unit is responsible for outputting the first isolation transformer The DC charging power source is rectified; a first filter is connected to the first synchronous rectification switching unit to filter the DC charging power source. The DC power backup system of claim 2, wherein the discharge device comprises: a second isolation transformer comprising a primary side and a secondary side, the primary side being the DC input terminal to receive from the battery device After the power is converted into the DC backup power supply, the secondary side is output; a second electronic switch is connected to the primary side of the second isolation transformer; and a second synchronous rectification switch unit is connected to the second isolation The secondary side of the transformer, and the output end is the DC output end, the second synchronous rectification switch unit is responsible for rectifying the DC backup power supply outputted by the second isolation transformer; a second filter is connected to the first The second synchronous rectification switch unit filters the DC backup power supply. The DC power backup system of claim 2, wherein the battery device comprises a plurality of battery strings connected in parallel to the second power supply port of the switch circuit, and each battery string comprises a plurality of batteries connected in series. The DC power backup system of claim 3, wherein the DC power backup module is plural, and the DC output terminals of the DC power backup modules are connected to the automatic switch through a battery power supply bus. a second power input end of the component, and the AC and DC input terminals of the DC power backup module are connected to the first power input end of the automatic switching switch element through an AC bus bar, and the power output end of the automatic switching switch component The input of the at least one AC/DC converter is connected through a load bus. The DC power backup system of claim 3, wherein the DC power backup module and the automatic switching component are respectively plural, and the DC output terminals of the DC power backup modules are powered by a battery. And connecting the second power input end of the automatic switching element, the first power input end of the automatic switching element is connected to a load bus for connecting to the power supply unit, and the DC power backup module is handed over The DC input is connected to the load bus. The DC power backup system of claim 8 or 9, wherein the DC power backup modules are electrically connected to each other through a current sharing control circuit. The DC power backup system of claim 4, further comprising: an auxiliary DC power supply unit, comprising a green energy device and a power conversion device, wherein the green energy device is a device that generates power from the green energy source, and the power conversion An input end of the device is connected to the output end of the green energy device; a first switch includes a first end, a second end and a third end, the first end is connected to the power supply unit of the power grid, the third end Connecting a first power input end of the at least one automatic switching element; a second switching switch includes a first end, a second end and a third end, the first end is connected to the second end of the first switch, and the third end is connected to the auxiliary DC power supply unit An output end of the conversion device, the second end being connected to the connection end of the battery device. The DC power backup system of claim 11, wherein the power conversion device of the auxiliary DC power supply unit comprises a third isolation transformer, a third electronic switch, a third synchronous rectifier switch unit and a third filter. The third isolation transformer includes a primary side and a secondary side, the primary side is connected to the green energy device, the third electronic switch is connected to the primary side of the third isolation transformer, and the input end of the third synchronous rectifier switch unit is connected to the third a secondary side of the isolation transformer, the third synchronous rectification switch unit is responsible for rectifying an auxiliary DC power outputted by the third isolation transformer, and the third filter is connected to the third synchronous rectification switch unit to the auxiliary DC power supply Filtering is performed.